Fast Company has today published a sizeable excerpt from Becoming Steve Jobs ($12 Amazon, $13 iBook), the upcoming book about the Apple cofounder’s’ life and his mannerisms. Unlike previous efforts, Apple is openly promoting this book and many executives, CEO Tim Cook included, have participated in interviews. This has yielded some very in-depth, intimate and interesting stories.

Following the story of Cook offering to give Jobs his liver, Cook is quoted as saying the Isaacson book did the late CEO a ‘disservice’. In very similar words to how Cue described the (unrelated) film about Jobs at SXSW, Cook says ‘The person I read about there is somebody I would never have wanted to work with over all this time’.

“The Steve that I met in early ’98 was brash and confident and passionate and all of those things. But there was a soft side of him as well, and that soft side became a larger portion of him over the next 13 years. You’d see that show up in different ways. There were different employees and spouses here that had health issues, and he would go out of his way to turn heaven and earth to make sure they had proper medical attention. He did that in a major way, not in a minor, ‘Call me and get back to me if you need my help’ kind of way.

Cook also recalls how Jobs would call up his mother on the pretense of finding Cook, but in reality just wanted to talk to his parents about convincing Cook to have more of a social life. ‘Someone who’s viewing life only as a transactional relationship with people…doesn’t do that’.